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Quantization step optimizing method

A technology of quantization step size and optimization method, which is applied in the field of optimization of DRA standard quantization step size, and can solve the problems of multi-bit, increase of local total bits, and inability to guarantee that the coding quantization step size index consumes the total number of bits.

Inactive Publication Date: 2011-04-27
数维科技(北京)有限公司
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Problems solved by technology

[0020] However, the above-mentioned processing of spectral holes (referred to as "alternative processing" in this paper) is not necessarily optimal, because although encoding d(n) in the alternative processing consumes fewer coding bits, it is possible to encode d (n+1)=a(n+1)-a(n) consumes more bits, which may further increase the local total bits of encoding d(n) and d(n+1)
Therefore, using alternative processing for quantization units with spectral holes does not guarantee that the total number of bits consumed by encoding the quantization step index is the least

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[0057] This section will use a specific example to illustrate the quantization step size optimization solution according to the embodiment of the present invention. As an example quantization unit such as Figure 4 , where each box represents a quantization unit, and the shaded boxes represent spectral holes. As mentioned above, the purpose of the present invention is to select the optimal quantization step index for the spectral hole, so as to reduce the encoding bit consumption, especially the local total bit reduction.

[0058] Specifically, in Figure 4where a(0)=? (expression to be determined, the same below), a(1)=74, a(2)=? , a(3)=64, a(4)=53, a(5)=? , a(6)=? , a(7)=42, a(8)=40. The following specifically explains how to determine the actual quantization step transmission value of the spectral hole according to the embodiment in FIG. 3 .

[0059] First, since the quantization unit corresponding to a(0) is a spectral hole, in step 11, enter into processing III40. ...

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Abstract

The invention provides a quantization step optimizing method, which comprises: determining the quantization step index of each quantization unit according to a quantization noise-to-mask ratio; correcting the quantization step indexes of quantization units of which the quantization coefficients are zero, namely spectrum holes, according to a certain criterion, and keeping the quantization step indexes of quantization units of which the quantization units are not zero, namely, which are not spectrum holes, constant; and performing the differentiation and entropy coding treatment on the corrected quantization step indexes of the spectrum holes and the quantization step indexes of the quantization step indexes which are not spectrum holes.

Description

technical field [0001] The present invention relates to a quantization step size optimization method, more specifically, relates to a DRA standard quantization step size optimization method. Background technique [0002] The full name of "DRA (digital rise audio) audio standard" is "Multi-channel Digital Audio Codec Technical Specification", which was officially promulgated by the China National Standardization Administration Committee on December 22, 2008 as a Chinese national standard (standard number GB / T22726-2008), the drafting unit of this standard includes the applicant of this application—Shuwei Technology (Beijing) Co., Ltd., etc. Anyone can purchase the DRA audio standard from institutions such as the China Institute of Electronic Technology Standardization without additional conditions. [0003] The application areas of the DRA audio standard include but are not limited to: digital TV, digital audio broadcasting, digital cinema, laser disc player, network stream...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/00G10L19/032
Inventor 王磊闫建新
Owner 数维科技(北京)有限公司